濕式化學法合成奈米氧化鋅粉體之光學特性研究

Synthesis of Zinc Oxide (ZnO) Nanoparticles Via a Wet Chemical Route and Their Photoluminescence Properties

陳頤專(Yi-Chuan Chen) ； 張清志(Ching-Chih Chang) ； 黃其清(Chyi-Ching Hwang)

《化學》 68卷1期 (2010/03) Pp. 69-75

https://doi.org/10.6623/chem.2010007

摘要

本研究使用試藥級醋酸鋅[Zn(CH_3COO)_2．2H_2O, ZnAc_2]與二甘醇[(CH_2CH_2OH)_2O, DEG]為原料，先經由一濕式化學法形成沉澱之前驅物，然後此前驅物於200-500°C之空氣氣氛下煅燒2小時即可得到晶粒尺寸~50nm之奈米級氧化鋅粉體，其具有P63mc對稱之纖鋅礦結構(wurtzite structure)。製程中樣品之檢測分析使用X光繞射儀(XRD)、傅立葉變換紅外光譜儀 (FTIR)、掃描式電子顯微鏡(SEM)、穿透式電子顯微鏡 (TEM)等儀器。合成所得產物之光致放光 (photoluminescence,PL)量測觀察到有一位於~380nm之狹窄的紫外光放射峰；以及另一較寬的綠光放射，其波峰位於~500nm。本研究證實提高煅燒溫度可明顯地改善氧化鋅產物之結晶性與發光特性；在500°C煅燒2小時所得之產物其結晶性較佳與晶粒分佈較為均勻。

關鍵字

氧化鋅 ； 奈米粉體 ； 濕式化學法 ； 光致放光

並列摘要

In the study, ZnO particles with nanocrystalline sizes less than 50 nm were synthesized through a wet chemical route using zinc acetate dihydrate (Zn(CH_3COO)_2．2H_2O) and diethylene glycol ((CH_2CH_2OH)_2O, DEG) as starting materials to form a precipitating precursor. After being calcined at 200-500 °C for 2 h in air, the precursor turned into nanocrystalline ZnO particles with wurtzite P63mc structure. The synthesis process was characterized by X-ray diffraction, Fourier transformation infrared spectroscopy, scanning electron microscopy, and transmission electron microscopy. Photoluminescence measurements confirmed that the ZnO nanoparticles exhibited near-UV emission at ~380 nm together with a green emission that was centred at ~500 nm. It was confirmed that both the crystalline size and photoluminescence property of the resulting ZnO were improved with increasing the calcination temperature. The better crystallinity and uniform distribution of product grains could be obtained by calcining precursor at 500 °C for 2 h.

並列關鍵字

ZnO ； Nanoparticles ； Wet chemical ； Photoluminescence